Homing / limits - the manual is misleading, possibly wrong

linuxcnc.org/docs/devel/html/config/ini-homing.html

Looks great!

rodw wrote: Chris,

Under Figure 1,

Code:

C is the home switch trip point

really should say

Code:

C is the home switch trip point (once triggered, home switch must remain active from the home switch position all the way to the hard limit)

Did you include something about this? Could not see it.

cmorley wrote: linuxcnc.org/docs/devel/html/config/ini-homing.html

Very nice, thank you.

Did you include something about this? Could not see it.

Yes in the prerequisite

If using a separate homing switch, it’s possible to start homing on the wrong side of the home switch,
which combined with HOME_IGNORE_LIMITS option will lead to a hard crash.
You can avoid this by making the home switch toggle it’s state when the trip dog is on a particular side until it returns passed the trip point again.
Said another way, the home switch state must represent the position of the dog relative to the switch (ie before or after the switch),
and must stay that way even if the dog coasts past the switch in the same direction.

Hi rodw,

I've been posting recently under "Sharing Limit Switches and Homing on a Single Input" looking for help with setting up Homing and Limit Switches using a single input pin on my breakout board. I have successfully gotten the single pin deal to work and stumbled around until I managed to get Homing and soft limits etc. to work. However, it would be a significantly large understatement if I said I don't actually understand how to correctly set the different variables.

I've been struggling to make sense of the different sections of the manual and tie it all together. A large part of that is my limitations but I'm starting to suspect there might also be some errors and omissions in the manual and areas that could be more clearly stated.

I've read a few of your comments and would appreciate your insights and suggestions. Would you please check out my posting if you have time and let me know what you think ? I just updated it to include a copy of the "Figure 2. Demonstrative Shares Switch Layout" image from the manual with extensive mark-ups to help me try to understand how things fit together, and, some areas where I have questions or think the information may be incorrect. Per your comments on this thread I believe I'm using the version of the manual you recommended and have put that info on the image I submitted.

Thanks in advance for any help you can provide.

Jay